Gas burner



Patented Aug. 17, 1926. p

UNITED STATES CLARENCE J'. LEVEY AND JOHN ZANDER, OF CHICAGO, ILLINOIS, ASSIGNORS TO NATIONAL MACHINE WORKS, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLI- N OIS.

GAS BURNER.

Application filed September 2, 1925.4 Serial No. 54,084.

This invention relates to gas burners for use in heating furnaces and the like and is fully described in the following specification and shown in the accompanying drawings, in which:

Figure 1 is a longitudinal section through the furnace.;

Fig. 2 is a sectional view on the line 2 2 of Fig. l with the furnace tube removed; and i Fig. 3 is an elevation of the delivery of the tube.

The burner comprises a body member l0 having a straight tubular portion 11 which terminates in a Haring portion 12. A coni cal member 13 is secured in the Haring portion by means of a plurality of separating legs 14 which are preferably welded at 15 to the wall of the Haring portion.

The conical member 13 is so proportioned that the cross sectional area of the annular space 16 is uniform throughout and equal to the cross sectional area of the straight tubular portion 11. e

The body 10 is adapted to be inserted in an opening 17 inside the furnace and has a fiange 18 through which bolts 19 may be inserted to secure the body to the furnace. The second flange 20 is formed on the outer end of the body and has an annular lip 21 which is adapted to receive legs of the spider 22 which is secured theretoF by means of bolts 23. The outer end of the spider is threaded to receive a gas pipe 24 and the inner end is threaded to receive the nozzle 25.

The legs of the spider are spaced as shown in Fig. 2 so as to leave openings 26 through which atmosphere may be aspirated into the tube 11 by gas passing through the nozzle 25. These openings are regulated by means of the shutter 27 which is rotatably mounted around the legs of the spider 22. The pressure of the gas at the nozzle 25 is regulated by means of a valve, not shown. a

Thus it will be seen that upon introducing a combustible gas through the tube 24;, this gas passing through the nozzle 25 will act in a well known manner to aspirate air through the openings 26, this gas and air mixing in the tube 11 and passing into the furnace. For maximum efficiency the mixture of gas and air is driven through the burner at substantially uniform rate of speed .throughout and this is accomplished as previously stated by using a center axial ly located conoidal member 13 which is so proportioned as to provide a passage 16 of uniform cross section throughout.

The velocity of the combustible mixture is so regulated as to keep it well above its rate of fiame propagation so that a fairly wide range of speeds may be permissible, thereby enabling the burner to be used with various degrees of gas pressure. Thus, the danger of the fiame flashing back into the mixing tube of the burner is greatly lessened and the danger is also reduced by the fact that at the delivery end the passage is quite narrow thereby vtending to keep the gaseous mixture well below the combustible temperature until after it has passed into the furnace. The outer end of the conoidal member 13 is preferably made hollow and filled with a refractory material 28 which further reduces the tendency of the cone 13 to absorb heat and transfer it to the incoming combustible mixture.

While we have shown and described but a single embodiment ofthis invention, it is to be understood that it is capable of many modications. Changes therefore in the construction and arrangement may be made which do not depart fromy the spirit and scope of the invention as disclosed in theappended claims.

We claim:

1. A gas burner comprising a burner tube, an aspirating jet adapted to deliver thereto, a conoidal member disposed in said tube forwardly of the .'jet, the space around the conoidal member being annular and lof substantially constant cross sectional area throughout the length of the conoidal member to enablethefuel mixture tobe driven through the burner at substantially the same speed throughout to avoid backf of the flame.

2. A gas burner comprising a burner tube, an aspirating jet adapted to deliver there flashing Q! n l1,596,667

to, and a eonoidal member disposed in said substantially the same speed throughout to tube forwardly of the jet to provide a throat avoid flashing back of the flame. between them, the space around the conoidal In testimony whereof .We have hereunto l0 member being annular, said throat and'said Set our hands and seals this 28th day of 5 space being of substantially constant cross August, 1925.`

sectional area throughout, to enable the fuel Y CLARENCE J. LEVEY. mixture to be driven throughrthe burner. et* Y VJOHN ZANDER. 

